Tidy up release_download_test.sh #2988

Job	Run time
macOS (macOS, jdk8u, temurin)	26m 3s
Linux (linux, jdk8u, temurin, adoptopenjdk/centos7_build_image)	23m 5s
macOS (macOS, jdk11u, temurin)	55m 58s
Windows (windows-2022, jdk8u, temurin)	30m 9s
Linux (linux, jdk11u, temurin, adoptopenjdk/centos7_build_image)	31m 11s
Windows (windows-2022, jdk11u, temurin)	1h 36m 38s
Linux (linux, jdk17u, temurin, adoptopenjdk/centos7_build_image)	44m 8s
Windows (windows-2022, jdk17u, temurin)	1h 37m 38s
Linux (linux, jdk, temurin, adoptopenjdk/centos7_build_image)	33m 52s
Windows (windows-2022, jdk, temurin)	1h 46m 43s
Linux (alpine-linux, jdk8u, temurin, adoptopenjdk/alpine3_build_image)	17m 59s
Linux (alpine-linux, jdk11u, temurin, adoptopenjdk/alpine3_build_image)	37m 56s
Linux (alpine-linux, jdk17u, temurin, adoptopenjdk/alpine3_build_image)	37m 36s
Linux (alpine-linux, jdk, temurin, adoptopenjdk/alpine3_build_image)	44m 11s
Linux (linux, jdk11u, dragonwell, adoptopenjdk/centos7_build_image)	1h 5m 11s
Linux (linux, jdk11u, fast_startup, adoptopenjdk/centos7_build_image)	46m 35s
Linux (linux, jdk11u, bisheng, adoptopenjdk/centos7_build_image)	3m 25s
	13h 18m 18s

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